Dose-response profile of degradation of agrochemical using lepidium

Estimation of the degradation profile of an agrochemical based on soil samples at depth 0-10cm from a calibration experiment.

Usage

data(lepidium)

Format

A data frame with 42 observations on the following 2 variables.

conc: a numeric vector of concentrations (g/ha)
weight: a numeric vector of plant weight (g) after 3 weeks' growth

Details

It is an experiment with seven concentrations and six replicates per concentration. Lepidium is rather robust as it only responds to high concentrations.

Source

Racine-Poon, A. (1988) A Bayesian Approach to Nonlinear Calibration Problems, J. Am. Statist. Ass., 83, 650–656.

Examples

library(drc)

lepidium.m1 <- drm(weight~conc, data=lepidium, fct = LL.4())

modelFit(lepidium.m1)
#> Lack-of-fit test
#> 
#>           ModelDf    RSS Df F value p value
#> ANOVA          35 14.187                   
#> DRC model      38 14.449  3  0.2159  0.8847

plot(lepidium.m1, type = "all", log = "")